Utah – anyone can vote for Bernie and you can even register up to and at the caucus (same day registration)
The doors open at 6pm and if you want to caucus you have to be in line by 8:30pm.
Idaho – anyone can vote for Bernie as long as they didn’t vote in the March 8th primaries (republican, 3rd party). Idaho also has same-day registration and you can even reserve your seat at the caucus beforehand.
Caucus times vary based on time zone. If your caucus is in Mountain Time, it runs from 6PM-9PM with doors closing at 7PM. If your caucus is in Pacific Time, it runs from 5PM-8PM with doors closing at 6PM.
Arizona – only democrats who registered by February 22nd can vote for Bernie.